Abstract: An oxide superconductor consisting of an oxide which comprises, as constituent metal elements, bismuth, lead, strontium, calcium and copper having a molar ratio of lead to bismuth of at least 0.2:1, and having an internal structure in which domains having a relatively high concentration of lead and no long-period structure are contained in domains having a relatively low concentration of lead and a long-period structure. This oxide superconductor has a storing pinning function and a high critical current density Jc even at a high temperature and a high magnetic field, can be produced by industrial methods, and is easily processed to form wires.

Abstract: An oxide superconductor consisting of an oxide which comprises, as constituent metal elements, bismuth, lead, strontium, calcium and copper having a molar ratio of lead to bismuth of at least 0.2:1, and having an internal structure in which domains having a relatively high concentration of lead and no long-period structure are contained in domains having a relatively low concentration of lead and a long-period structure. This oxide superconductor has a storing pinning function and a high critical current density Jc even at a high temperature and a high magnetic field, can be produced by industrial methods, and is easily processed to form wires.

Abstract: A process for forming a single crystal superconducting LnA.sub.2 Cu.sub.3 O.sub.7-x film, wherein Ln is at least one rare earth element and A is at least one alkaline earth element, is disclosed, which comprises simultaneously evaporating Ln, A and Cu in an atomic ratio of about 1:2:3 from discrete evaporation sources of Ln, A and Cu onto a heated substrate in a vacuum vessel while blowing an oxygen gas onto the substrate to form an oxygen-containing atmosphere, thereby forming the single crystal superconducting film on the substrate.

Abstract: A ferroelectric thin film consisting of a single crystal of BaTiO.sub.3 which has a perovskite structure is produced by a method comprising evaporating Ba and Ti in an atomic ratio of 1:1 from discrete evaporation sources of Ba and Ti to deposit them on a substrate in a vacuum deposition vessel while supplying a small amount of an oxygen gas to the reactor.

Abstract: A laminated film comprising at least two thin films of single crystal LnBa.sub.2 Cu.sub.3 O.sub.7-x wherein Ln is Y or one of lanthanoids except Pr and Tb having the (001) plane in the direction parallel with the film surface and at least one continuous thin film of Y.sub.2 O.sub.3 which has a thickness of not larger than 100 .ANG. and the (001) plane in the direction parallel with the film surface and is interposed between a pair of said thin films of single crystal LnBa.sub.2 Cu.sub.3 O.sub.7-x, wherein the thin films of single crystal LnBa.sub.2 Cu.sub.3 O.sub.7-x has good superconductive properties.

Abstract: A laminated film comprising a thin film of single crystal YBa.sub.2 Cu.sub.3 O.sub.7-x having the (001) plane in the direction parallel with the film surface and a continuous insulating ultrathin layer of MgO which is formed on said superconductor film and has a thickness of not larger than 10.ANG. and the (001) plane in a direction parallel with the film surface is provided.